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Dinitrogen pentoxide, N2O5, decomposes by first-order kinetics with a rate constant of 0.15 s-1 at 353 K.

(a) What is the half-life (in seconds) for the decomposition of N2O5 at 353 K?

(b) If [N2O5]0 = 0.0579 mol·L-1, what will be the concentration of N2O5 after 4.0 s?

(c) How much time (in minutes) will elapse before the N2O5 concentration decreases from 0.0579 mol·L-1 to 0.0143 mol·L-1?

  • Chemistry -

    a. k = 0.693/t1/2
    b. ln(No/N) = kt.
    No = given
    N =?
    k = from part a.
    t = 4 s.

    same equation as b but
    No = given
    N = given
    k = from a
    t = ?
    Note that part a is given in seconds, part c wants the answer in min.

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